<template>
	<view>
		<view class="search-box">
			<!-- 使用 uni-ui 提供的搜索组件 -->
			<uni-search-bar :radius="100" @input="input" focus="true"  cancelButton="none" placeholder="请输入搜索内容"></uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length!==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item.goods_id)">
				<view class="goods-name">
					{{item.goods_name}}
				</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag :text="item" v-for="(item,i) in historys" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
		
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 延时器的 timerId
				timer: null,
				// 搜索关键词
				kw: '',
				// 搜索结果列表
				searchResults: [],
				// 搜索关键词的历史记录
				historyList: []
			};
		},
		computed:{
			historys(){
				return [...this.historyList].reverse()
			}
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw')||'[]')
		},
		methods:{
			input(e) {
				clearTimeout(this.timer)
				this.timer = setTimeout(()=>{
					this.kw = e
					this.getSearchList()
				},500)
			},
			// 根据搜索关键词，搜索商品建议列表
			async getSearchList() {
				// 判断关键词是否为空
				if (this.kw === '') {
					this.searchResults = []
					return
				}
				const {data:res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				if(res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				this.saveSearchHistroy()
			},
			gotoDetail(goods_id){
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+goods_id
				})
			},
			saveSearchHistroy(){
				// this.historyList.push(this.kw)
				// this.historyList.unshift(this.kw)
				// this.historyList = [...new Set(this.historyList)]
				  
				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)
				
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean() {
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw) {
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		}
	}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
	padding: 0 5px;
	.sugg-item{
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		display: flex;
		align-items: center;
		justify-content: space-between;
		.goods-name{
			// 文字不允许换行（单行文本）
			white-space: nowrap;
			// 溢出部分隐藏
			overflow: hidden;
			// 文本溢出后，使用 ... 代替
			text-overflow: ellipsis;
			margin-right: 3px;
		}
	}
}
.history-box{
	padding: 0 5px;
	.history-title{
		display: flex;
		align-items: center;
		justify-content: space-between;
		height: 40px;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
	}
	.history-list {
		display: flex;
		flex-wrap: wrap;
		.uni-tag {
			margin-top: 5px;
			margin-right: 5px;
		}
	}
}
</style>
